A wireless power transmission method includes: receiving a communication signal from a wireless power receiver; determining, based on the communication signal, phases of polarization channels of a reference antenna array, at which the wireless power receiver receives maximum power; determining, by activating a first antenna array together with the reference antenna array, phases of polarization channels of the first antenna array such that the wireless power receiver receives maximum power; determining, by deactivating the first antenna array and activating a second antenna array together with the reference antenna array, phases of polarization channels of the second antenna array such that the wireless power receiver receives maximum power; and transmitting, to the wireless power receiver, a power signal generated by using the antenna arrays, the phases of which are determined.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A wireless power transmission method comprising: receiving a communication signal from a wireless power receiver; determining, based on the communication signal, phases of polarization channels of a reference antenna array, at which the wireless power receiver receives maximum power; determining, by activating a first antenna array together with the reference antenna array, phases of polarization channels of the first antenna array such that the wireless power receiver receives maximum power; determining, by deactivating the first antenna array and activating a second antenna array together with the reference antenna array, phases of polarization channels of the second antenna array such that the wireless power receiver receives maximum power; and transmitting, to the wireless power receiver, a power signal generated by using the reference antenna array, the first antenna array, and the second antenna array, wherein the determining of the phases of the polarization channels of the first antenna array comprises: determining, in a state in which only a first polarization channel of two polarization channels of the first antenna array is activated, a first phase of the first polarization channel, at which the wireless power receiver receives maximum power; and after determining the first phase, determining, by activating a second polarization channel, a second phase of the second polarization channel, at which the wireless power receiver receives maximum power.
2. The wireless power transmission method of claim 1 , wherein the determining of the phases of the polarization channels of the reference antenna array comprises: transmitting a variable power signal by adjusting a relative phase of two polarization channels included in the reference antenna array; receiving, from the wireless power receiver receiving the variable power signal, the communication signal including information about power received by the wireless power receiver; and determining the phases of the two polarization channels, based on the communication signal.
3. The wireless power transmission method of claim 1 , wherein the polarization channels of the reference antenna array comprise a horizontal linear polarization channel and a vertical linear polarization channel.
4. The wireless power transmission method of claim 1 , wherein the polarization channels of the reference antenna array comprise a right hand circular polarization channel and a left hand circular polarization channel.
5. The wireless power transmission method of claim 1 , further comprising: sequentially determining phases of polarization channels of all antenna arrays included in a wireless power transmitter; calculating a complex amplitude of the polarization channels of each of all the antenna arrays, by using the determined phases of the polarization channels of all the antenna arrays; and generating, according to the calculated complex amplitude, a wireless power signal with respect to the wireless power receiver.
6. The wireless power transmission method of claim 1 , further comprising: receiving a plurality of communication signals from a plurality of wireless power receivers; determining phases of polarization channels of antenna arrays with respect to each of the plurality of wireless power receivers; generating a plurality of power signals by using the determined phases of the polarization channels of the antenna arrays; and transmitting the power signals to the plurality of wireless power receivers, respectively.
7. The wireless power transmission method of claim 6 , wherein the determining of the phases of the polarization channels of the antenna arrays with respect to each of the plurality of wireless power receivers is sequentially or simultaneously performed with respect to the plurality of wireless power receivers.
8. The wireless power transmission method of claim 1 , wherein the communication signal comprises at least one of a magnitude of power received by the wireless power receiver, a charge rate of the wireless power receiver, a location of the wireless power receiver, or a state of the wireless power receiver.
9. The wireless power transmission method of claim 1 , wherein each of the polarization channels of the reference antenna array comprises a phase converter and a power control amplifier.
10. The wireless power transmission method of claim 1 , wherein each of the polarization channels of the reference antenna array comprises a phase converter and a fixed gain amplifier.
11. The wireless power transmission method of claim 1 , wherein the wireless power receiver comprises an antenna having one polarization channel and the polarization channel is connected to a rectifier to form a rectenna.
12. The wireless power transmission method of claim 1 , wherein the wireless power receiver comprises an antenna having two polarization channels and the two polarization channels being coupled to a first rectifier and a second rectifier, respectively, wherein output values of the first and second rectifiers are combined in a common direct current (DC) load.
13. A wireless power transmitter comprising: an antenna portion comprising a plurality of antenna arrays comprising two separate polarization channels for transmitting a wireless power signal; a processor; and a memory, wherein the processor is configured to: determine, after receiving a communication signal from a wireless power receiver, phases of polarization channels of a reference antenna array, at which the wireless power receiver receives maximum power, based on the communication signal; determine, by activating a first antenna array together with the reference antenna array, phases of polarization channels of the first antenna array such that the wireless power receiver receives maximum power; determine, by deactivating the first antenna array and activating a second antenna array together with the reference antenna array, phases of polarization channels of the second antenna array such that the wireless power receiver receives maximum power; and transmit, to the wireless power receiver, a power signal generated by using the reference antenna array, the first antenna array, and the second antenna array, and wherein the processor is further configured to: determine, in a state in which only a first polarization channel of two polarization channels of the first antenna array is activated, a first phase of the first polarization channel, at which the wireless power receiver receives maximum power; and after determining the first phase, determine, by activating a second polarization channel, a second phase of the second polarization channel, at which the wireless power receiver receives maximum power.
14. A computer program product comprising a non-transitory recording medium storing a computer program to: determine, after receiving a communication signal from a wireless power receiver, phases of polarization channels of a reference antenna array, at which the wireless power receiver receives maximum power, based on the communication signal; determine, by activating a first antenna array together with the reference antenna array, phases of polarization channels of the first antenna array such that the wireless power receiver receives maximum power; determine, by deactivating the first antenna array and activating a second antenna array together with the reference antenna array, phases of polarization channels of the second antenna array such that the wireless power receiver receives maximum power; transmit, to the wireless power receiver, a power signal generated by using the reference antenna array, the first antenna array, and the second antenna array; determine, in a state in which only a first polarization channel of two polarization channels of the first antenna array is activated, a first phase of the first polarization channel, at which the wireless power receiver receives maximum power; and after determining the first phase, determine, by activating a second polarization channel, a second phase of the second polarization channel, at which the wireless power receiver receives maximum power.
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August 3, 2018
July 20, 2021
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